"...but if You can do anything,
have pity on us and help us."
And Jesus said to him,
"If you can! All things are possible
to him who believes."
Immediately the father of the child cried out,
and said, "I believe;
help my unbelief."

Mark 9. 22-24
(not wishing for something,
or "thinking positively,"
but believing in Christ)